Treetop shelter of a neotropical river otter cub (Lontra longicaudis - Carnivora: Mustelidae) in an Amazonian flooded forest

Santos, Pedro Manuel Ribeiro Simões dos; Kinupp, Valdely Ferreira; Coletto-Silva, Alexandre

doi:10.1590/s0044-59672007000200020

Cited by 1 publication

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“…Notwithstanding, little is known about the reproductive aspects of these two species and most reproductive data are from behavioral observations, without anatomical analyses of the gonads (Duplaix, 1980;Carter and Rosas, 1997;Larivière, 1999;Rosas and de Mattos, 2003;Evangelista, 2004;Arcila and Ramírez, 2004;Rosas et al, 2007;Santos et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Gross anatomy and histology of giant otter (Pteronura brasiliensis) and neotropical otter (Lontra longicaudis) testes

et al. 2011

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The gonads of six adult giant otter males (Pteronura brasiliensis) and of one adult neotropical otter male (Lontra longicaudis) were analyzed both for histology and gross anatomy. The mean testes mass/body mass ratio in giant otters was 0.046 ± 0.0071%. The presence of spermatozoa inside the seminiferous and epididymal tubules revealed that two-year-old giant otters were already sexually mature. The mean diameter of the seminiferous and epididymal tubules of mature giant otters was 126.3 ± 13.37 μm and 198.8 ± 31.19 μm, respectively. The small amount of spermatozoa in the testes and epidimydes of 5 out of 6 giant otters analyzed suggests a seasonal testes activity in this species, which is in accordance to the observations of a monogamous mating system and seasonal reproduction of free-ranging giant otters. The testes of the neotropical otter were proportionally larger, wider and heavier than the testes of the giant otters. The testes mass/body mass ratio in L. longicaudis was 0.25%, 5.5 times greater than that of giant otters. The mean diameter of the seminiferous and epididymal tubules of the neotropical otter were 179.8 ± 17.01 μm and 238.5 ± 24.64 μm, respectively, which were significantly larger than those of the giant otter. The differences in testes size between these two otter species might be related to different mating systems. The greater dimensions of the testes of the neotropical otter, together with the greater body size of males when compared to females, suggest a non-monogamous mating system in this species, probably polyginy or promiscuity, which, however, needs to be better investigated.

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